Piston construction



Dec. 18 ,1923.

H. C. METZGER PISTON CONSTRUCTION Filed May 27. 1920 INVENTOR. Harry 61 fz'ger ATTORNEY$ Patented Dec. l8, i923.

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HARRY C. METZGER, OF LOS ANGELES, CALIFOEINIA, ASSIGNOR T6 ATLAS MACHINE WORKS, INC., OF LOS ANGELES, CALIFORNIA, A COBPORATEON OF CALIFORNIA.

PISTON CONSTRUCTION.

Application filed May 2?,

T0 aZZ 107mm 2'2? may concern:

Be it known that l, HARRY C. Mnrzcnn, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful improvements in Piston Constructions, of which the following is a specification.

This invention relates to piston constructions for the type of piston comprising a hollow cylinder, and such as is employed in internal combustion engines.

it is the object of the invention to provide a piston construction wherein reinforcing and strengthening means are provided upon the piston, said reinforcing means, preferably, being formed integral with the piston and comprising a spiral rib upon the inner surface of the hollow cylindrical piston.

The invention will be readily understood from the following description of the accompanying drawings, in which- Figure l is a longitudinal section through piston constructed in accordance with the invention.

Fig. 2 is a transverse section on the line 2-2 of Fig. 1.

The improved piston construction is shown embodied in a piston of usual construction comprising the hollow cylinder 1, having the inwardly projecting bosses 2, and the upright angularly disposed, strengthening ribs 3 and a in the hollow interior of the piston above the bosses 2 and depending from the top wall 5 of the piston. The usual grooves 6 are provided upon the exterior of the piston for the usual piston rings.

The strengthening means provided in the improved piston construction comprises a reinforcement upon the wall of the piston and, preferably formed integralwith the piston. In the present embodiment of the invention this reinforcement is shown as a spiral rib 7 extending inwardly from the in ner surface of the piston wall and formed in tegral with the piston wall. This spiral rib, preferably, starts at a point adjacent the lower open end of the piston, and the convolutions of said rib extend along the inner surface of the piston wall to a point adjacent the bosses 2. Immediately beyond said bosses, and preferably, in horizontal alinement therewith, the convolutions of the spi rib are continued toward the top of the piston along the inner surface of the wall 1920. Serial No. 384,721.

thereof, with the rib extending through the upright rib 3. The spiral rib, preferably,

terminates at its upper end at the juncture tons comprising a spiral strengthening rib extending along the inner surface of the piston from end to end thereof.

3. A piston construction for hollow pistons comprising a spiral strengthening rib integral with the piston and extending along the inner surface thereof.

4. A piston construction for hollow pistons comprising a spiral strengthening rib integral with the piston and extending along the inner surface thereof from end to end of said piston.

5. A piston construction for hollow pistons comprising a spiral strengthening rib integral with the piston and extending along the inner surface thereof, and axially disposed transverse strengthening plates integral with said piston and extending from the inner surface thereof and having said spiral rib intersecting the same.

6. In a piston having a cylindrical body, a head at one endof the body, and a flange at the other end of the body, a rib in the body extending around and through the body and having its ends connected to the head and flange.

7 A hollow piston, provided with a rib on the inside of the wall thereof, the path of said rib describing a helix and said rib extending substantially from end to end of the piston.

In testimony whereof I have signed my name to this specification.

HARRY C. METZGER. 

